From: Sandy Harris <sandy@storm.ca>
To: parisc-linux@thepuffingroup.com
Subject: Re: [parisc-linux] Parallel port hardware (fwd)
Date: Mon, 29 Nov 1999 23:16:09 +0000 [thread overview]
Message-ID: <38430939.435033DA@storm.ca> (raw)
In-Reply-To: 199911291708.JAA10386@meow.sr.hp.com
"Bill Katz (William)" wrote:
> Sandy Harris wrote:
> |Can anyone point me to info on the electrical properties of the parallel ports
> |on 712 or 715 machines?
> |
> |I'm thinking that 8 715s might make an interesting parallel engine, but the cable device
> |only works if the parallel port's control lines are implemented as open collector TTL.
> |Where can I discover whether they are?
>
> Early 715s ...
>
> Later 715s (/64, /80, /100) and all 712s use Lasi. From the chip ERS
> (not published, it's mostly electrical stuff) Data strobe, autofeed,
> parinit, and select
>
> The ones that connect to pins 1, 14, 16, and 17 are open collector.
Bingo! Those are exactly the four lines used for the Wapers parallel stuff.
http://garage.ecn.purdue.edu/~papers/WAPERS/
prev parent reply other threads:[~1999-11-30 4:16 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-11-29 17:08 [parisc-linux] Parallel port hardware (fwd) Bill Katz (William)
1999-11-29 17:55 ` Philipp Rumpf
1999-11-29 23:16 ` Sandy Harris [this message]
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